Mitsubishi PLK-E1010 Instruction Manual

9. BAD SEWING CONDITION & ITS CAUSE AND REMEDY [NOTE]

Please fix the troubles during the sewing machine operation with referring to the following instructions. Beside, if the trouble conditions are not coming under these classification, please contact the sewing machine dealers nearby.

Ref. page & Item

Bad condition

Cause

Remedy

Poor thread quality

Use better quality thread Adjust thread tension Adjust thread take up spring properly Change needle to suitable size Change them new ones or grind them with buffing wheel or grind stone Change it new one or grind it with buffing wheel

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Tight upper thread tension Strong thread take up spring Upper thread is thicker than needle size Damages on shuttle hook or driver Damages inside presser foot needle hole Needle touches with presser foot needle hole Needle and shuttle hook are not in proper timing Thread tension discs are not opened at trimming Thread take up spring swings too much Upper thread is broken before regular trimming Needle size is bigger than thread size Pre-tension is too tight Thread guide is in wrong position Needle and shuttle hook are in bad timing Thread melts with needle heat

7-14

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1. Upper thread breakage often happens

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Move presser foot position

7-6-1(6)

Adjust the timing

7-2

Slow down sewing speed

6-2(4)

Use silicon oil

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Use needle cooler

Adjust thread tension release Adjust thread take up spring’s swing stroke Adjust fixed knife and needle plate position Change needle to suitable size Adjust thread guide position properly Adjust the position properly Adjust trimmer cam position Adjust movable knife position Adjust synchronizer position Use non racing spring with bobbin Loosen bobbin thread tension spring Decrease pre-tension Adjust trimmer cam position Adjust synchronizer position Make thread take up swing stroke smaller Advance thread tension release timing Adjust thread guide position properly Adjust pre-tension

7-17

7-14

7-12

2. Upper thread is pulled out from needle

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7-16

7-5

7-2

7-10 7-11 7-18

Trimmer timing is not correct

Too short bobbin thread by bobbin spinning at trimming Bobbin thread tension is too tight

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6-3(1)

7-16 7-10 7-18 7-13

3. Skip stitch happens at start sewing

Thread tail from needle is very short after trimming

Control unit

7-5

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From the library of Superior Sewing Machine & Supply LLC • www.supsew.com